A 28 year old man presents with rapid pounding in the chest. He is completely conscious throughout. The ECG was taken (SVT). What is the 1st med to be used to manage this condition?

The key is B. Adenosine. [Management of SVT: i) vagal manoeuvres (carotid sinus message, valsalva

manoeuvre) transiently increase AV-block, and unmask the underlying atrial rhythm. If unsuccessful

then the first medicine used in SVT is adenosine, which causes transient AV block and works by i)

transiently slowing ventricles to show the underlying atrial rhythm ii) cardioverting a junctional

tachycardia to sinus rhythm. OHCM].